1510 lines
45 KiB
Rust
1510 lines
45 KiB
Rust
use {
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crate::{
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fmt::Formatter,
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lexer::{self, Lexer, Token, TokenKind},
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Ident,
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},
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alloc::{boxed::Box, string::String, vec::Vec},
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core::{
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alloc::Layout,
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cell::{RefCell, UnsafeCell},
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fmt::{self},
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intrinsics::unlikely,
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marker::PhantomData,
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ops::Deref,
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ptr::NonNull,
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sync::atomic::AtomicUsize,
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},
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};
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pub type Pos = u32;
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pub type IdentFlags = u32;
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pub type FileId = u32;
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pub type IdentIndex = u16;
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pub type LoaderError = String;
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pub type Loader<'a> = &'a mut (dyn FnMut(&str, &str, FileKind) -> Result<FileId, LoaderError> + 'a);
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#[derive(PartialEq, Eq, Debug)]
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pub enum FileKind {
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Module,
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Embed,
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}
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trait Trans {
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fn trans(self) -> Self;
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}
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impl<T> Trans for Option<Option<T>> {
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fn trans(self) -> Self {
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match self {
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Some(None) => None,
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Some(Some(v)) => Some(Some(v)),
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None => Some(None),
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}
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}
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}
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pub const SOURCE_TO_AST_FACTOR: usize = 7 * (core::mem::size_of::<usize>() / 4) + 1;
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pub mod idfl {
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use super::*;
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macro_rules! flags {
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($($name:ident,)*) => {
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$(pub const $name: IdentFlags = 1 << (core::mem::size_of::<IdentFlags>() * 8 - 1 - ${index(0)});)*
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pub const ALL: IdentFlags = 0 $(| $name)*;
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};
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}
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flags! {
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MUTABLE,
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REFERENCED,
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COMPTIME,
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}
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}
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pub fn no_loader(_: &str, _: &str, _: FileKind) -> Result<FileId, LoaderError> {
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Ok(0)
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}
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#[derive(Debug)]
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pub struct Symbol {
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pub name: Ident,
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pub flags: IdentFlags,
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}
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#[derive(Clone, Copy)]
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struct ScopeIdent {
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ident: Ident,
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declared: bool,
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ordered: bool,
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flags: IdentFlags,
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}
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pub struct Parser<'a, 'b> {
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path: &'b str,
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loader: Loader<'b>,
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lexer: Lexer<'a>,
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arena: &'a Arena,
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ctx: &'b mut Ctx,
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token: Token,
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ns_bound: usize,
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trailing_sep: bool,
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packed: bool,
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}
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impl<'a, 'b> Parser<'a, 'b> {
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pub fn parse(
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ctx: &'b mut Ctx,
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input: &'a str,
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path: &'b str,
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loader: Loader<'b>,
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arena: &'a Arena,
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) -> &'a [Expr<'a>] {
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let mut lexer = Lexer::new(input);
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Self {
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loader,
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token: lexer.eat(),
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lexer,
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path,
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ctx,
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arena,
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ns_bound: 0,
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trailing_sep: false,
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packed: false,
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}
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.file()
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}
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fn file(&mut self) -> &'a [Expr<'a>] {
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let f = self.collect_list(TokenKind::Semi, TokenKind::Eof, |s| s.expr_low(true));
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self.pop_scope(0);
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if !self.ctx.idents.is_empty() {
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// TODO: we need error recovery
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let mut idents = core::mem::take(&mut self.ctx.idents);
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for id in idents.drain(..) {
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self.report(
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id.ident.pos(),
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format_args!("undeclared identifier: {}", self.lexer.slice(id.ident.range())),
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);
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}
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self.ctx.idents = idents;
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}
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f
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}
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fn next(&mut self) -> Token {
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core::mem::replace(&mut self.token, self.lexer.eat())
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}
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fn ptr_expr(&mut self) -> Option<&'a Expr<'a>> {
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Some(self.arena.alloc(self.expr()?))
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}
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fn expr_low(&mut self, top_level: bool) -> Option<Expr<'a>> {
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let left = self.unit_expr()?;
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self.bin_expr(left, 0, top_level)
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}
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fn expr(&mut self) -> Option<Expr<'a>> {
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self.expr_low(false)
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}
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fn bin_expr(&mut self, mut fold: Expr<'a>, min_prec: u8, top_level: bool) -> Option<Expr<'a>> {
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loop {
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let Some(prec) = self.token.kind.precedence() else { break };
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if prec <= min_prec {
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break;
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}
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let Token { kind: op, start: pos, .. } = self.next();
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if op == TokenKind::Decl {
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self.declare_rec(&fold, top_level);
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}
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let right = self.unit_expr()?;
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let right = self.bin_expr(right, prec, false)?;
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let right = self.arena.alloc(right);
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let left = self.arena.alloc(fold);
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if let Some(op) = op.ass_op() {
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self.flag_idents(*left, idfl::MUTABLE);
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let right = Expr::BinOp { left: self.arena.alloc(fold), pos, op, right };
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fold = Expr::BinOp {
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left,
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pos,
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op: TokenKind::Assign,
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right: self.arena.alloc(right),
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};
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} else {
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fold = Expr::BinOp { left, right, pos, op };
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if op == TokenKind::Assign {
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self.flag_idents(*left, idfl::MUTABLE);
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}
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}
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}
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Some(fold)
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}
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fn declare_rec(&mut self, expr: &Expr, top_level: bool) {
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match *expr {
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Expr::Ident { pos, id, is_first, .. } => {
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self.declare(pos, id, !top_level, is_first || top_level)
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}
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Expr::Ctor { fields, .. } => {
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for CtorField { value, .. } in fields {
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self.declare_rec(value, top_level)
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}
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}
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_ => _ = self.report(expr.pos(), "cant declare this shit (yet)"),
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}
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}
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fn declare(&mut self, pos: Pos, id: Ident, ordered: bool, valid_order: bool) {
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if !valid_order {
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self.report(
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pos,
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format_args!(
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"out of order declaration not allowed: {}",
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self.lexer.slice(id.range())
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),
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);
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}
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let Ok(index) = self.ctx.idents.binary_search_by_key(&id, |s| s.ident) else {
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self.report(pos, "the identifier is rezerved for a builtin (proably)");
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return;
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};
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if core::mem::replace(&mut self.ctx.idents[index].declared, true) {
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self.report(
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pos,
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format_args!("redeclaration of identifier: {}", self.lexer.slice(id.range())),
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);
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return;
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}
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self.ctx.idents[index].ordered = ordered;
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}
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fn resolve_ident(&mut self, token: Token) -> (Ident, bool) {
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let is_ct = token.kind == TokenKind::CtIdent;
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let name = self.lexer.slice(token.range());
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if let Some(builtin) = crate::ty::from_str(name) {
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return (Ident::builtin(builtin), false);
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}
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let (i, id, bl) = match self
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.ctx
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.idents
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.iter_mut()
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.enumerate()
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.rfind(|(_, elem)| self.lexer.slice(elem.ident.range()) == name)
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{
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Some((i, elem)) => (i, elem, false),
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None => {
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let ident = match Ident::new(token.start, name.len() as _) {
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None => {
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self.report(token.start, "identifier can at most have 64 characters");
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Ident::new(token.start, 63).unwrap()
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}
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Some(id) => id,
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};
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self.ctx.idents.push(ScopeIdent {
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ident,
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declared: false,
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ordered: false,
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flags: 0,
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});
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(self.ctx.idents.len() - 1, self.ctx.idents.last_mut().unwrap(), true)
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}
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};
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id.flags |= idfl::COMPTIME * is_ct as u32;
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if id.declared && id.ordered && self.ns_bound > i {
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id.flags |= idfl::COMPTIME;
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self.ctx.captured.push(id.ident);
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}
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(id.ident, bl)
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}
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fn tok_str(&mut self, range: Token) -> &'a str {
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self.lexer.slice(range.range())
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}
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fn unit_expr(&mut self) -> Option<Expr<'a>> {
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use {Expr as E, TokenKind as T};
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let frame = self.ctx.idents.len();
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let token @ Token { start: pos, .. } = self.next();
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let prev_boundary = self.ns_bound;
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let prev_captured = self.ctx.captured.len();
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let mut expr = match token.kind {
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T::Ct => E::Ct { pos, value: self.ptr_expr()? },
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T::Directive if self.lexer.slice(token.range()) == "use" => {
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self.expect_advance(TokenKind::LParen)?;
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let str = self.expect_advance(TokenKind::DQuote)?;
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self.expect_advance(TokenKind::RParen)?;
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let path = self.lexer.slice(str.range());
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let path = &path[1..path.len() - 1];
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E::Mod {
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pos,
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path,
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id: match (self.loader)(path, self.path, FileKind::Module) {
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Ok(id) => id,
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Err(e) => {
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self.report(str.start, format_args!("error loading dependency: {e:#}"))?
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}
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},
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}
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}
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T::Directive if self.lexer.slice(token.range()) == "embed" => {
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self.expect_advance(TokenKind::LParen)?;
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let str = self.expect_advance(TokenKind::DQuote)?;
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self.expect_advance(TokenKind::RParen)?;
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let path = self.lexer.slice(str.range());
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let path = &path[1..path.len() - 1];
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E::Embed {
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pos,
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path,
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id: match (self.loader)(path, self.path, FileKind::Embed) {
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Ok(id) => id,
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Err(e) => self.report(
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str.start,
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format_args!("error loading embedded file: {e:#}"),
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)?,
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},
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}
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}
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T::Directive => E::Directive {
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pos: pos - 1, // need to undo the directive shift
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name: self.tok_str(token),
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args: {
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self.expect_advance(T::LParen)?;
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self.collect_list(T::Comma, T::RParen, Self::expr)
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},
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},
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T::True => E::Bool { pos, value: true },
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T::False => E::Bool { pos, value: false },
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T::Null => E::Null { pos },
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T::Idk => E::Idk { pos },
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T::DQuote => E::String { pos, literal: self.tok_str(token) },
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T::Packed => {
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self.packed = true;
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let expr = self.unit_expr()?;
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if self.packed {
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self.report(
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expr.pos(),
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"this can not be packed \
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(unlike your mom that gets packed every day by me)",
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);
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}
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expr
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}
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T::Struct => E::Struct {
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packed: core::mem::take(&mut self.packed),
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fields: {
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self.ns_bound = self.ctx.idents.len();
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self.expect_advance(T::LBrace)?;
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self.collect_list(T::Comma, T::RBrace, |s| {
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let tok = s.token;
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Some(if s.advance_if(T::Comment) {
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CommentOr::Comment { literal: s.tok_str(tok), pos: tok.start }
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} else {
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let name = s.expect_advance(T::Ident)?;
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s.expect_advance(T::Colon)?;
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CommentOr::Or(StructField {
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pos: name.start,
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name: s.tok_str(name),
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ty: s.expr()?,
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})
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|
})
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})
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},
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captured: {
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self.ns_bound = prev_boundary;
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let captured = &mut self.ctx.captured[prev_captured..];
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crate::quad_sort(captured, core::cmp::Ord::cmp);
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let preserved = captured.partition_dedup().0.len();
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self.ctx.captured.truncate(prev_captured + preserved);
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self.arena.alloc_slice(&self.ctx.captured[prev_captured..])
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},
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pos: {
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|
if self.ns_bound == 0 {
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// we might save some memory
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self.ctx.captured.clear();
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|
}
|
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pos
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},
|
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trailing_comma: core::mem::take(&mut self.trailing_sep),
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},
|
|
T::Ident | T::CtIdent => {
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let (id, is_first) = self.resolve_ident(token);
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E::Ident { pos, is_ct: token.kind == T::CtIdent, id, is_first }
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}
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T::If => E::If {
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pos,
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cond: self.ptr_expr()?,
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then: self.ptr_expr()?,
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else_: self.advance_if(T::Else).then(|| self.ptr_expr()).trans()?,
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},
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|
T::Loop => E::Loop { pos, body: self.ptr_expr()? },
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|
T::Break => E::Break { pos },
|
|
T::Continue => E::Continue { pos },
|
|
T::Return => E::Return {
|
|
pos,
|
|
val: (!matches!(
|
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self.token.kind,
|
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T::Semi | T::RBrace | T::RBrack | T::RParen | T::Comma
|
|
))
|
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.then(|| self.ptr_expr())
|
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.trans()?,
|
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},
|
|
T::Fn => E::Closure {
|
|
pos,
|
|
args: {
|
|
self.expect_advance(T::LParen)?;
|
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self.collect_list(T::Comma, T::RParen, |s| {
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let name = s.advance_ident()?;
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let (id, _) = s.resolve_ident(name);
|
|
s.declare(name.start, id, true, true);
|
|
s.expect_advance(T::Colon)?;
|
|
Some(Arg {
|
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pos: name.start,
|
|
name: s.tok_str(name),
|
|
is_ct: name.kind == T::CtIdent,
|
|
id,
|
|
ty: s.expr()?,
|
|
})
|
|
})
|
|
},
|
|
ret: {
|
|
self.expect_advance(T::Colon)?;
|
|
self.ptr_expr()?
|
|
},
|
|
body: self.ptr_expr()?,
|
|
},
|
|
T::Ctor => self.ctor(pos, None),
|
|
T::Tupl => self.tupl(pos, None),
|
|
T::LBrack => E::Slice {
|
|
item: self.ptr_unit_expr()?,
|
|
size: self.advance_if(T::Semi).then(|| self.ptr_expr()).trans()?,
|
|
pos: {
|
|
self.expect_advance(T::RBrack)?;
|
|
pos
|
|
},
|
|
},
|
|
T::Band | T::Mul | T::Xor | T::Sub => E::UnOp {
|
|
pos,
|
|
op: token.kind,
|
|
val: {
|
|
let expr = self.ptr_unit_expr()?;
|
|
if token.kind == T::Band {
|
|
self.flag_idents(*expr, idfl::REFERENCED);
|
|
}
|
|
expr
|
|
},
|
|
},
|
|
T::LBrace => E::Block { pos, stmts: self.collect_list(T::Semi, T::RBrace, Self::expr) },
|
|
T::Number => {
|
|
let slice = self.lexer.slice(token.range());
|
|
let (slice, radix) = match &slice.get(0..2) {
|
|
Some("0x") => (&slice[2..], Radix::Hex),
|
|
Some("0b") => (&slice[2..], Radix::Binary),
|
|
Some("0o") => (&slice[2..], Radix::Octal),
|
|
_ => (slice, Radix::Decimal),
|
|
};
|
|
E::Number {
|
|
pos,
|
|
value: match u64::from_str_radix(slice, radix as u32) {
|
|
Ok(value) => value,
|
|
Err(e) => self.report(token.start, format_args!("invalid number: {e}"))?,
|
|
} as i64,
|
|
radix,
|
|
}
|
|
}
|
|
T::Float => E::Float {
|
|
pos,
|
|
value: match <f64 as core::str::FromStr>::from_str(self.lexer.slice(token.range()))
|
|
{
|
|
Ok(f) => f.to_bits(),
|
|
Err(e) => self.report(token.start, format_args!("invalid float: {e}"))?,
|
|
},
|
|
},
|
|
T::LParen => {
|
|
let expr = self.expr()?;
|
|
self.expect_advance(T::RParen)?;
|
|
expr
|
|
}
|
|
T::Comment => Expr::Comment { pos, literal: self.tok_str(token) },
|
|
tok => self.report(token.start, format_args!("unexpected token: {tok}"))?,
|
|
};
|
|
|
|
loop {
|
|
let token = self.token;
|
|
if matches!(token.kind, T::LParen | T::Ctor | T::Dot | T::Tupl | T::LBrack) {
|
|
self.next();
|
|
}
|
|
|
|
expr = match token.kind {
|
|
T::LParen => Expr::Call {
|
|
func: self.arena.alloc(expr),
|
|
args: self.collect_list(T::Comma, T::RParen, Self::expr),
|
|
trailing_comma: core::mem::take(&mut self.trailing_sep),
|
|
},
|
|
T::Ctor => self.ctor(token.start, Some(expr)),
|
|
T::Tupl => self.tupl(token.start, Some(expr)),
|
|
T::LBrack => E::Index {
|
|
base: self.arena.alloc(expr),
|
|
index: {
|
|
let index = self.expr()?;
|
|
self.expect_advance(T::RBrack)?;
|
|
self.arena.alloc(index)
|
|
},
|
|
},
|
|
T::Dot => E::Field {
|
|
target: self.arena.alloc(expr),
|
|
pos: token.start,
|
|
name: {
|
|
let token = self.expect_advance(T::Ident)?;
|
|
self.tok_str(token)
|
|
},
|
|
},
|
|
_ => break,
|
|
}
|
|
}
|
|
|
|
if matches!(token.kind, T::Loop | T::LBrace | T::Fn) {
|
|
self.pop_scope(frame);
|
|
}
|
|
|
|
Some(expr)
|
|
}
|
|
|
|
fn tupl(&mut self, pos: Pos, ty: Option<Expr<'a>>) -> Expr<'a> {
|
|
Expr::Tupl {
|
|
pos,
|
|
ty: ty.map(|ty| self.arena.alloc(ty)),
|
|
fields: self.collect_list(TokenKind::Comma, TokenKind::RParen, Self::expr),
|
|
trailing_comma: core::mem::take(&mut self.trailing_sep),
|
|
}
|
|
}
|
|
|
|
fn ctor(&mut self, pos: Pos, ty: Option<Expr<'a>>) -> Expr<'a> {
|
|
Expr::Ctor {
|
|
pos,
|
|
ty: ty.map(|ty| self.arena.alloc(ty)),
|
|
fields: self.collect_list(TokenKind::Comma, TokenKind::RBrace, |s| {
|
|
let name_tok = s.advance_ident()?;
|
|
let name = s.tok_str(name_tok);
|
|
Some(CtorField {
|
|
pos: name_tok.start,
|
|
name,
|
|
value: if s.advance_if(TokenKind::Colon) {
|
|
s.expr()?
|
|
} else {
|
|
let (id, is_first) = s.resolve_ident(name_tok);
|
|
Expr::Ident { pos: name_tok.start, is_ct: false, id, is_first }
|
|
},
|
|
})
|
|
}),
|
|
trailing_comma: core::mem::take(&mut self.trailing_sep),
|
|
}
|
|
}
|
|
|
|
fn advance_ident(&mut self) -> Option<Token> {
|
|
let next = self.next();
|
|
if matches!(next.kind, TokenKind::Ident | TokenKind::CtIdent) {
|
|
Some(next)
|
|
} else {
|
|
self.report(self.token.start, format_args!("expected identifier, found {}", next.kind))?
|
|
}
|
|
}
|
|
|
|
fn pop_scope(&mut self, frame: usize) {
|
|
let mut undeclared_count = frame;
|
|
for i in frame..self.ctx.idents.len() {
|
|
if !&self.ctx.idents[i].declared {
|
|
self.ctx.idents.swap(i, undeclared_count);
|
|
undeclared_count += 1;
|
|
}
|
|
}
|
|
|
|
self.ctx
|
|
.idents
|
|
.drain(undeclared_count..)
|
|
.map(|ident| Symbol { name: ident.ident, flags: ident.flags })
|
|
.collect_into(&mut self.ctx.symbols);
|
|
}
|
|
|
|
fn ptr_unit_expr(&mut self) -> Option<&'a Expr<'a>> {
|
|
Some(self.arena.alloc(self.unit_expr()?))
|
|
}
|
|
|
|
fn collect_list<T: Copy>(
|
|
&mut self,
|
|
delim: TokenKind,
|
|
end: TokenKind,
|
|
mut f: impl FnMut(&mut Self) -> Option<T>,
|
|
) -> &'a [T] {
|
|
let mut trailing_sep = false;
|
|
let mut view = self.ctx.stack.view();
|
|
'o: while !self.advance_if(end) {
|
|
let val = match f(self) {
|
|
Some(val) => val,
|
|
None => {
|
|
let mut paren = None::<TokenKind>;
|
|
let mut depth = 0;
|
|
loop {
|
|
let tok = self.next();
|
|
if tok.kind == TokenKind::Eof {
|
|
break 'o;
|
|
}
|
|
if let Some(par) = paren {
|
|
if par == tok.kind {
|
|
depth += 1;
|
|
} else if tok.kind.closing() == par.closing() {
|
|
depth -= 1;
|
|
if depth == 0 {
|
|
paren = None;
|
|
}
|
|
}
|
|
} else if tok.kind == delim {
|
|
continue 'o;
|
|
} else if tok.kind == end {
|
|
break 'o;
|
|
} else if tok.kind.closing().is_some() && paren.is_none() {
|
|
paren = Some(tok.kind);
|
|
depth = 1;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
trailing_sep = self.advance_if(delim);
|
|
unsafe { self.ctx.stack.push(&mut view, val) };
|
|
}
|
|
self.trailing_sep = trailing_sep;
|
|
self.arena.alloc_slice(unsafe { self.ctx.stack.finalize(view) })
|
|
}
|
|
|
|
fn advance_if(&mut self, kind: TokenKind) -> bool {
|
|
if self.token.kind == kind {
|
|
self.next();
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
#[must_use]
|
|
fn expect_advance(&mut self, kind: TokenKind) -> Option<Token> {
|
|
let next = self.next();
|
|
if next.kind != kind {
|
|
self.report(next.start, format_args!("expected {}, found {}", kind, next.kind))?
|
|
} else {
|
|
Some(next)
|
|
}
|
|
}
|
|
|
|
#[track_caller]
|
|
fn report(&mut self, pos: Pos, msg: impl fmt::Display) -> Option<!> {
|
|
if log::log_enabled!(log::Level::Error) {
|
|
use core::fmt::Write;
|
|
writeln!(
|
|
self.ctx.errors.get_mut(),
|
|
"{}",
|
|
Report::new(self.lexer.source(), self.path, pos, msg)
|
|
)
|
|
.unwrap();
|
|
}
|
|
None
|
|
}
|
|
|
|
fn flag_idents(&mut self, e: Expr<'a>, flags: IdentFlags) {
|
|
match e {
|
|
Expr::Ident { id, .. } => find_ident(&mut self.ctx.idents, id).flags |= flags,
|
|
Expr::Field { target, .. } => self.flag_idents(*target, flags),
|
|
_ => {}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn find_ident(idents: &mut [ScopeIdent], id: Ident) -> &mut ScopeIdent {
|
|
idents.binary_search_by_key(&id, |si| si.ident).map(|i| &mut idents[i]).unwrap()
|
|
}
|
|
|
|
pub fn find_symbol(symbols: &[Symbol], id: Ident) -> &Symbol {
|
|
// TODO: we can turn this to direct index
|
|
symbols.binary_search_by_key(&id, |s| s.name).map(|i| &symbols[i]).unwrap()
|
|
}
|
|
|
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
|
pub struct Arg<'a> {
|
|
pub pos: u32,
|
|
pub name: &'a str,
|
|
pub id: Ident,
|
|
pub is_ct: bool,
|
|
pub ty: Expr<'a>,
|
|
}
|
|
|
|
impl Poser for Arg<'_> {
|
|
fn posi(&self) -> Pos {
|
|
self.pos
|
|
}
|
|
}
|
|
|
|
macro_rules! generate_expr {
|
|
($(#[$meta:meta])* $vis:vis enum $name:ident<$lt:lifetime> {$(
|
|
$(#[$field_meta:meta])*
|
|
$variant:ident {
|
|
|
|
$($field:ident: $ty:ty,)*
|
|
},
|
|
)*}) => {
|
|
$(#[$meta])*
|
|
$vis enum $name<$lt> {$(
|
|
$(#[$field_meta])*
|
|
$variant {
|
|
$($field: $ty,)*
|
|
},
|
|
)*}
|
|
|
|
impl<$lt> $name<$lt> {
|
|
pub fn used_bytes(&self) -> usize {
|
|
match self {
|
|
$(Self::$variant { $($field),* } => {
|
|
0 $(.max($field as *const _ as usize - self as *const _ as usize
|
|
+ core::mem::size_of::<$ty>()))*
|
|
})*
|
|
}
|
|
}
|
|
|
|
pub fn pos(&self) -> Pos {
|
|
#[expect(unused_variables)]
|
|
match self {
|
|
$(Self::$variant { $($field),* } => generate_expr!(@first $(($field),)*).posi(),)*
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
(@filed_names $variant:ident $ident1:ident) => { Self::$variant { $ident1: a } };
|
|
|
|
(@first ($($first:tt)*), $($rest:tt)*) => { $($first)* };
|
|
(@last ($($ign:tt)*), $($rest:tt)*) => { $($rest)* };
|
|
(@last ($($last:tt)*),) => { $($last)* };
|
|
}
|
|
|
|
#[repr(u8)]
|
|
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
|
|
pub enum Radix {
|
|
Hex = 16,
|
|
Octal = 8,
|
|
Binary = 2,
|
|
Decimal = 10,
|
|
}
|
|
|
|
generate_expr! {
|
|
/// `LIST(start, sep, end, elem) => start { elem sep } [elem] end`
|
|
/// `OP := grep for `#define OP:`
|
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
|
pub enum Expr<'a> {
|
|
/// `'ct' Expr`
|
|
Ct {
|
|
pos: Pos,
|
|
value: &'a Self,
|
|
},
|
|
/// `'"([^"]|\\")"'`
|
|
String {
|
|
pos: Pos,
|
|
literal: &'a str,
|
|
},
|
|
/// `'//[^\n]' | '/*' { '([^/*]|*/)*' | Comment } '*/'
|
|
Comment {
|
|
pos: Pos,
|
|
literal: &'a str,
|
|
},
|
|
/// `'break'`
|
|
Break {
|
|
pos: Pos,
|
|
},
|
|
/// `'continue'`
|
|
Continue {
|
|
pos: Pos,
|
|
},
|
|
/// `'fn' LIST('(', ',', ')', Ident ':' Expr) ':' Expr Expr`
|
|
Closure {
|
|
pos: Pos,
|
|
args: &'a [Arg<'a>],
|
|
ret: &'a Self,
|
|
body: &'a Self,
|
|
},
|
|
/// `Expr LIST('(', ',', ')', Expr)`
|
|
Call {
|
|
func: &'a Self,
|
|
args: &'a [Self],
|
|
trailing_comma: bool,
|
|
},
|
|
/// `'return' [Expr]`
|
|
Return {
|
|
pos: Pos,
|
|
val: Option<&'a Self>,
|
|
},
|
|
/// note: ':unicode:' is any utf-8 character except ascii
|
|
/// `'[a-zA-Z_:unicode:][a-zA-Z0-9_:unicode:]*'`
|
|
Ident {
|
|
pos: Pos,
|
|
is_ct: bool,
|
|
is_first: bool,
|
|
id: Ident,
|
|
//name: &'a str,
|
|
},
|
|
/// `LIST('{', [';'], '}', Expr)`
|
|
Block {
|
|
pos: Pos,
|
|
stmts: &'a [Self],
|
|
},
|
|
/// `'0b[01]+' | '0o[0-7]+' | '[0-9]+' | '0b[01]+'`
|
|
Number {
|
|
pos: Pos,
|
|
value: i64,
|
|
radix: Radix,
|
|
},
|
|
/// `'[0-9]+.[0-9]*'`
|
|
Float {
|
|
pos: Pos,
|
|
value: u64,
|
|
},
|
|
/// node: precedence defined in `OP` applies
|
|
/// `Expr OP Expr`
|
|
BinOp {
|
|
left: &'a Self,
|
|
pos: Pos,
|
|
op: TokenKind,
|
|
right: &'a Self,
|
|
},
|
|
/// `'if' Expr Expr [else Expr]`
|
|
If {
|
|
pos: Pos,
|
|
cond: &'a Self,
|
|
then: &'a Self,
|
|
else_: Option<&'a Self>,
|
|
},
|
|
/// `'loop' Expr`
|
|
Loop {
|
|
pos: Pos,
|
|
body: &'a Self,
|
|
},
|
|
/// `('&' | '*' | '^') Expr`
|
|
UnOp {
|
|
pos: Pos,
|
|
op: TokenKind,
|
|
val: &'a Self,
|
|
},
|
|
/// `'struct' LIST('{', ',', '}', Ident ':' Expr)`
|
|
Struct {
|
|
pos: Pos,
|
|
fields: &'a [CommentOr<'a, StructField<'a>>],
|
|
captured: &'a [Ident],
|
|
trailing_comma: bool,
|
|
packed: bool,
|
|
},
|
|
/// `[Expr] LIST('.{', ',', '}', Ident [':' Expr])`
|
|
Ctor {
|
|
pos: Pos,
|
|
ty: Option<&'a Self>,
|
|
fields: &'a [CtorField<'a>],
|
|
trailing_comma: bool,
|
|
},
|
|
/// `[Expr] LIST('.(', ',', ')', Ident [':' Expr])`
|
|
Tupl {
|
|
pos: Pos,
|
|
ty: Option<&'a Self>,
|
|
fields: &'a [Self],
|
|
trailing_comma: bool,
|
|
},
|
|
/// `'[' Expr [';' Expr] ']'`
|
|
Slice {
|
|
pos: Pos,
|
|
size: Option<&'a Self>,
|
|
item: &'a Self,
|
|
},
|
|
/// `Expr '[' Expr ']'`
|
|
Index {
|
|
base: &'a Self,
|
|
index: &'a Self,
|
|
},
|
|
/// `Expr '.' Ident`
|
|
Field {
|
|
target: &'a Self,
|
|
// we put it second place because its the pos of '.'
|
|
pos: Pos,
|
|
name: &'a str,
|
|
},
|
|
/// `'true' | 'false'`
|
|
Bool {
|
|
pos: Pos,
|
|
value: bool,
|
|
},
|
|
/// `'null'`
|
|
Null {
|
|
pos: Pos,
|
|
},
|
|
/// `'idk'`
|
|
Idk {
|
|
pos: Pos,
|
|
},
|
|
/// `'@' Ident List('(', ',', ')', Expr)`
|
|
Directive {
|
|
pos: Pos,
|
|
name: &'a str,
|
|
args: &'a [Self],
|
|
},
|
|
/// `'@use' '(' String ')'`
|
|
Mod {
|
|
pos: Pos,
|
|
id: FileId,
|
|
path: &'a str,
|
|
},
|
|
/// `'@use' '(' String ')'`
|
|
Embed {
|
|
pos: Pos,
|
|
id: FileId,
|
|
path: &'a str,
|
|
},
|
|
}
|
|
}
|
|
|
|
impl Expr<'_> {
|
|
pub fn declares(&self, iden: Result<Ident, &str>, source: &str) -> Option<Ident> {
|
|
match *self {
|
|
Self::Ident { id, .. } if iden == Ok(id) || iden == Err(&source[id.range()]) => {
|
|
Some(id)
|
|
}
|
|
Self::Ctor { fields, .. } => fields.iter().find_map(|f| f.value.declares(iden, source)),
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
pub fn has_ct(&self, symbols: &[Symbol]) -> bool {
|
|
match *self {
|
|
Self::Ident { id, .. } => find_symbol(symbols, id).flags & idfl::COMPTIME != 0,
|
|
Self::Ctor { fields, .. } => fields.iter().any(|f| f.value.has_ct(symbols)),
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
pub fn find_pattern_path<T, F: FnOnce(&Expr) -> T>(
|
|
&self,
|
|
ident: Ident,
|
|
target: &Expr,
|
|
mut with_final: F,
|
|
) -> Result<T, F> {
|
|
match *self {
|
|
Self::Ident { id, .. } if id == ident => Ok(with_final(target)),
|
|
Self::Ctor { fields, .. } => {
|
|
for &CtorField { name, value, pos } in fields {
|
|
match value.find_pattern_path(
|
|
ident,
|
|
&Expr::Field { pos, target, name },
|
|
with_final,
|
|
) {
|
|
Ok(value) => return Ok(value),
|
|
Err(e) => with_final = e,
|
|
}
|
|
}
|
|
Err(with_final)
|
|
}
|
|
_ => Err(with_final),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
|
|
pub struct StructField<'a> {
|
|
pub pos: Pos,
|
|
pub name: &'a str,
|
|
pub ty: Expr<'a>,
|
|
}
|
|
|
|
impl Poser for StructField<'_> {
|
|
fn posi(&self) -> Pos {
|
|
self.pos
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
|
pub struct CtorField<'a> {
|
|
pub pos: Pos,
|
|
pub name: &'a str,
|
|
pub value: Expr<'a>,
|
|
}
|
|
|
|
impl Poser for CtorField<'_> {
|
|
fn posi(&self) -> Pos {
|
|
self.pos
|
|
}
|
|
}
|
|
|
|
pub trait Poser {
|
|
fn posi(&self) -> Pos;
|
|
}
|
|
|
|
impl Poser for Pos {
|
|
fn posi(&self) -> Pos {
|
|
*self
|
|
}
|
|
}
|
|
|
|
impl Poser for Expr<'_> {
|
|
fn posi(&self) -> Pos {
|
|
self.pos()
|
|
}
|
|
}
|
|
|
|
impl<T: Poser> Poser for CommentOr<'_, T> {
|
|
fn posi(&self) -> Pos {
|
|
match self {
|
|
CommentOr::Or(expr) => expr.posi(),
|
|
CommentOr::Comment { pos, .. } => *pos,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
|
|
pub enum CommentOr<'a, T> {
|
|
Or(T),
|
|
Comment { literal: &'a str, pos: Pos },
|
|
}
|
|
|
|
impl<T: Copy> CommentOr<'_, T> {
|
|
pub fn or(&self) -> Option<T> {
|
|
match *self {
|
|
CommentOr::Or(v) => Some(v),
|
|
CommentOr::Comment { .. } => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
pub struct Display<'a> {
|
|
source: &'a str,
|
|
expr: &'a Expr<'a>,
|
|
}
|
|
|
|
impl<'a> Display<'a> {
|
|
pub fn new(source: &'a str, expr: &'a Expr<'a>) -> Self {
|
|
Self { source, expr }
|
|
}
|
|
}
|
|
|
|
impl core::fmt::Display for Display<'_> {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
Formatter::new(self.source).fmt(self.expr, f)
|
|
}
|
|
}
|
|
|
|
#[derive(Default)]
|
|
pub struct Ctx {
|
|
pub errors: RefCell<String>,
|
|
symbols: Vec<Symbol>,
|
|
stack: StackAlloc,
|
|
idents: Vec<ScopeIdent>,
|
|
captured: Vec<Ident>,
|
|
}
|
|
|
|
impl Ctx {
|
|
pub fn clear(&mut self) {
|
|
self.errors.get_mut().clear();
|
|
|
|
debug_assert_eq!(self.symbols.len(), 0);
|
|
debug_assert_eq!(self.stack.len, 0);
|
|
debug_assert_eq!(self.idents.len(), 0);
|
|
debug_assert_eq!(self.captured.len(), 0);
|
|
}
|
|
}
|
|
|
|
#[repr(C)]
|
|
pub struct AstInner<T: ?Sized> {
|
|
ref_count: AtomicUsize,
|
|
pub mem: ArenaChunk,
|
|
exprs: *const [Expr<'static>],
|
|
|
|
pub path: Box<str>,
|
|
pub file: Box<str>,
|
|
pub symbols: T,
|
|
}
|
|
|
|
impl AstInner<[Symbol]> {
|
|
fn layout(syms: usize) -> core::alloc::Layout {
|
|
core::alloc::Layout::new::<AstInner<()>>()
|
|
.extend(core::alloc::Layout::array::<Symbol>(syms).unwrap())
|
|
.unwrap()
|
|
.0
|
|
}
|
|
|
|
fn new(file: Box<str>, path: Box<str>, ctx: &mut Ctx, loader: Loader) -> NonNull<Self> {
|
|
let arena = Arena::with_capacity(
|
|
SOURCE_TO_AST_FACTOR * file.bytes().filter(|b| !b.is_ascii_whitespace()).count(),
|
|
);
|
|
let exprs =
|
|
unsafe { core::mem::transmute(Parser::parse(ctx, &file, &path, loader, &arena)) };
|
|
|
|
crate::quad_sort(&mut ctx.symbols, |a, b| a.name.cmp(&b.name));
|
|
|
|
let layout = Self::layout(ctx.symbols.len());
|
|
|
|
unsafe {
|
|
let ptr = alloc::alloc::alloc(layout);
|
|
let inner: *mut Self = core::ptr::from_raw_parts_mut(ptr as *mut _, ctx.symbols.len());
|
|
|
|
core::ptr::write(inner as *mut AstInner<()>, AstInner {
|
|
ref_count: AtomicUsize::new(1),
|
|
mem: arena.chunk.into_inner(),
|
|
exprs,
|
|
path,
|
|
file,
|
|
symbols: (),
|
|
});
|
|
core::ptr::addr_of_mut!((*inner).symbols)
|
|
.as_mut_ptr()
|
|
.copy_from_nonoverlapping(ctx.symbols.as_ptr(), ctx.symbols.len());
|
|
ctx.symbols.clear();
|
|
|
|
NonNull::new_unchecked(inner)
|
|
}
|
|
}
|
|
|
|
pub fn report<D>(&self, pos: Pos, msg: D) -> Report<D> {
|
|
Report::new(&self.file, &self.path, pos, msg)
|
|
}
|
|
}
|
|
|
|
pub struct Report<'a, D> {
|
|
file: &'a str,
|
|
path: &'a str,
|
|
pos: Pos,
|
|
msg: D,
|
|
}
|
|
|
|
impl<'a, D> Report<'a, D> {
|
|
pub fn new(file: &'a str, path: &'a str, pos: Pos, msg: D) -> Self {
|
|
Self { file, path, pos, msg }
|
|
}
|
|
}
|
|
|
|
impl<D: core::fmt::Display> core::fmt::Display for Report<'_, D> {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
report_to(self.file, self.path, self.pos, &self.msg, f);
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
fn report_to(file: &str, path: &str, pos: Pos, msg: &dyn fmt::Display, out: &mut impl fmt::Write) {
|
|
let (line, mut col) = lexer::line_col(file.as_bytes(), pos);
|
|
#[cfg(feature = "std")]
|
|
let disp = crate::fs::display_rel_path(path);
|
|
#[cfg(not(feature = "std"))]
|
|
let disp = path;
|
|
_ = writeln!(out, "{}:{}:{}: {}", disp, line, col, msg);
|
|
|
|
let line = &file[file[..pos as usize].rfind('\n').map_or(0, |i| i + 1)
|
|
..file[pos as usize..].find('\n').map_or(file.len(), |i| i + pos as usize)];
|
|
col += line.matches('\t').count() * 3;
|
|
|
|
for char in line.chars() {
|
|
if char == '\t' {
|
|
_ = out.write_str(" ");
|
|
} else {
|
|
_ = out.write_char(char);
|
|
}
|
|
}
|
|
_ = out.write_char('\n');
|
|
for _ in 0..col - 1 {
|
|
_ = out.write_str(" ");
|
|
}
|
|
_ = out.write_str("^\n");
|
|
}
|
|
|
|
#[derive(PartialEq, Eq, Hash)]
|
|
pub struct Ast(NonNull<AstInner<[Symbol]>>);
|
|
|
|
impl Ast {
|
|
pub fn new(
|
|
path: impl Into<Box<str>>,
|
|
content: impl Into<Box<str>>,
|
|
ctx: &mut Ctx,
|
|
loader: Loader,
|
|
) -> Self {
|
|
Self(AstInner::new(content.into(), path.into(), ctx, loader))
|
|
}
|
|
|
|
pub fn exprs(&self) -> &[Expr] {
|
|
unsafe { &*self.inner().exprs }
|
|
}
|
|
|
|
fn inner(&self) -> &AstInner<[Symbol]> {
|
|
unsafe { self.0.as_ref() }
|
|
}
|
|
|
|
pub fn find_decl(&self, id: Result<Ident, &str>) -> Option<(&Expr, Ident)> {
|
|
self.exprs().iter().find_map(|expr| match expr {
|
|
Expr::BinOp { left, op: TokenKind::Decl, .. } => {
|
|
left.declares(id, &self.file).map(|id| (expr, id))
|
|
}
|
|
_ => None,
|
|
})
|
|
}
|
|
|
|
pub fn ident_str(&self, ident: Ident) -> &str {
|
|
&self.file[ident.range()]
|
|
}
|
|
}
|
|
|
|
impl Default for Ast {
|
|
fn default() -> Self {
|
|
Self(AstInner::new("".into(), "".into(), &mut Ctx::default(), &mut no_loader))
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Copy)]
|
|
#[repr(packed)]
|
|
pub struct ExprRef(NonNull<Expr<'static>>);
|
|
|
|
impl ExprRef {
|
|
pub fn new(expr: &Expr) -> Self {
|
|
Self(NonNull::from(expr).cast())
|
|
}
|
|
|
|
pub fn get<'a>(&self, from: &'a Ast) -> &'a Expr<'a> {
|
|
assert!(from.mem.contains(self.0.as_ptr() as _));
|
|
// SAFETY: the pointer is or was a valid reference in the past, if it points within one of
|
|
// arenas regions, it muts be walid, since arena does not give invalid pointers to its
|
|
// allocations
|
|
unsafe { { self.0 }.as_ref() }
|
|
}
|
|
|
|
pub fn dangling() -> Self {
|
|
Self(NonNull::dangling())
|
|
}
|
|
}
|
|
|
|
impl Default for ExprRef {
|
|
fn default() -> Self {
|
|
Self::dangling()
|
|
}
|
|
}
|
|
|
|
unsafe impl Send for Ast {}
|
|
unsafe impl Sync for Ast {}
|
|
|
|
impl Clone for Ast {
|
|
fn clone(&self) -> Self {
|
|
unsafe { self.0.as_ref() }.ref_count.fetch_add(1, core::sync::atomic::Ordering::Relaxed);
|
|
Self(self.0)
|
|
}
|
|
}
|
|
|
|
impl Drop for Ast {
|
|
fn drop(&mut self) {
|
|
let inner = unsafe { self.0.as_ref() };
|
|
if inner.ref_count.fetch_sub(1, core::sync::atomic::Ordering::Relaxed) == 1 {
|
|
let inner = unsafe { self.0.as_mut() };
|
|
let len = inner.symbols.len();
|
|
unsafe { core::ptr::drop_in_place(inner) };
|
|
let layout = AstInner::layout(len);
|
|
unsafe {
|
|
alloc::alloc::dealloc(self.0.as_ptr() as _, layout);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Deref for Ast {
|
|
type Target = AstInner<[Symbol]>;
|
|
|
|
fn deref(&self) -> &Self::Target {
|
|
self.inner()
|
|
}
|
|
}
|
|
|
|
struct StackAllocView<T> {
|
|
prev: usize,
|
|
base: usize,
|
|
_ph: PhantomData<T>,
|
|
}
|
|
|
|
struct StackAlloc {
|
|
data: *mut u8,
|
|
len: usize,
|
|
cap: usize,
|
|
}
|
|
|
|
impl StackAlloc {
|
|
const MAX_ALIGN: usize = 16;
|
|
|
|
fn view<T: Copy>(&mut self) -> StackAllocView<T> {
|
|
let prev = self.len;
|
|
let align = core::mem::align_of::<T>();
|
|
assert!(align <= Self::MAX_ALIGN);
|
|
self.len = (self.len + align - 1) & !(align - 1);
|
|
StackAllocView { base: self.len, prev, _ph: PhantomData }
|
|
}
|
|
|
|
unsafe fn push<T: Copy>(&mut self, _view: &mut StackAllocView<T>, value: T) {
|
|
if unlikely(self.len + core::mem::size_of::<T>() > self.cap) {
|
|
let next_cap = self.cap.max(16 * 32).max(core::mem::size_of::<T>()) * 2;
|
|
if self.cap == 0 {
|
|
let layout =
|
|
core::alloc::Layout::from_size_align_unchecked(next_cap, Self::MAX_ALIGN);
|
|
self.data = alloc::alloc::alloc(layout);
|
|
} else {
|
|
let old_layout =
|
|
core::alloc::Layout::from_size_align_unchecked(self.cap, Self::MAX_ALIGN);
|
|
self.data = alloc::alloc::realloc(self.data, old_layout, next_cap);
|
|
}
|
|
self.cap = next_cap;
|
|
}
|
|
|
|
let dst = self.data.add(self.len) as *mut T;
|
|
debug_assert!(dst.is_aligned());
|
|
self.len += core::mem::size_of::<T>();
|
|
core::ptr::write(dst, value);
|
|
}
|
|
|
|
unsafe fn finalize<T: Copy>(&mut self, view: StackAllocView<T>) -> &[T] {
|
|
if unlikely(self.cap == 0) {
|
|
return &[];
|
|
}
|
|
let slice = core::slice::from_ptr_range(
|
|
self.data.add(view.base) as *const T..self.data.add(self.len) as *const T,
|
|
);
|
|
self.len = view.prev;
|
|
slice
|
|
}
|
|
}
|
|
|
|
impl Default for StackAlloc {
|
|
fn default() -> Self {
|
|
Self { data: core::ptr::null_mut(), len: 0, cap: 0 }
|
|
}
|
|
}
|
|
|
|
impl Drop for StackAlloc {
|
|
fn drop(&mut self) {
|
|
let layout =
|
|
unsafe { core::alloc::Layout::from_size_align_unchecked(self.cap, Self::MAX_ALIGN) };
|
|
unsafe { alloc::alloc::dealloc(self.data, layout) };
|
|
}
|
|
}
|
|
|
|
#[derive(Default)]
|
|
pub struct Arena {
|
|
chunk: UnsafeCell<ArenaChunk>,
|
|
}
|
|
|
|
impl Arena {
|
|
pub fn with_capacity(cap: usize) -> Arena {
|
|
Self { chunk: UnsafeCell::new(ArenaChunk::new(cap, ArenaChunk::default())) }
|
|
}
|
|
|
|
pub fn alloc<'a>(&'a self, expr: Expr<'a>) -> &'a Expr<'a> {
|
|
let layout = core::alloc::Layout::from_size_align(
|
|
expr.used_bytes(),
|
|
core::mem::align_of::<Expr<'a>>(),
|
|
)
|
|
.unwrap();
|
|
let ptr = self.alloc_low(layout);
|
|
unsafe {
|
|
ptr.cast::<u8>().copy_from_nonoverlapping(NonNull::from(&expr).cast(), layout.size())
|
|
};
|
|
unsafe { ptr.cast::<Expr<'a>>().as_ref() }
|
|
}
|
|
|
|
pub fn alloc_slice<'a, T: Copy>(&'a self, slice: &[T]) -> &'a [T] {
|
|
if slice.is_empty() || core::mem::size_of::<T>() == 0 {
|
|
return &mut [];
|
|
}
|
|
|
|
let layout = core::alloc::Layout::array::<T>(slice.len()).unwrap();
|
|
let ptr = self.alloc_low(layout);
|
|
unsafe { ptr.as_ptr().cast::<T>().copy_from_nonoverlapping(slice.as_ptr(), slice.len()) };
|
|
unsafe { core::slice::from_raw_parts(ptr.as_ptr() as _, slice.len()) }
|
|
}
|
|
|
|
fn alloc_low(&self, layout: core::alloc::Layout) -> NonNull<u8> {
|
|
let chunk = unsafe { &mut *self.chunk.get() };
|
|
|
|
if let Some(ptr) = chunk.alloc(layout) {
|
|
return ptr;
|
|
}
|
|
|
|
const EXPANSION_ALLOC: usize = 1024 * 4 - core::mem::size_of::<ArenaChunk>();
|
|
|
|
if layout.size() > EXPANSION_ALLOC {
|
|
let next_ptr = chunk.next_ptr();
|
|
if next_ptr.is_null() {
|
|
unsafe {
|
|
core::ptr::write(
|
|
chunk,
|
|
ArenaChunk::new(
|
|
layout.size() + layout.align() - 1 + core::mem::size_of::<ArenaChunk>(),
|
|
Default::default(),
|
|
),
|
|
);
|
|
}
|
|
} else {
|
|
unsafe {
|
|
let chunk = ArenaChunk::new(
|
|
layout.size() + layout.align() - 1 + core::mem::size_of::<ArenaChunk>(),
|
|
core::ptr::read(next_ptr),
|
|
);
|
|
let alloc = chunk.base.add(chunk.base.align_offset(layout.align()));
|
|
core::ptr::write(next_ptr, chunk);
|
|
return NonNull::new_unchecked(alloc);
|
|
}
|
|
}
|
|
} else {
|
|
unsafe {
|
|
core::ptr::write(chunk, ArenaChunk::new(EXPANSION_ALLOC, core::ptr::read(chunk)));
|
|
}
|
|
}
|
|
|
|
chunk.alloc(layout).unwrap()
|
|
}
|
|
|
|
pub fn clear(&mut self) {
|
|
let size = self.chunk.get_mut().size();
|
|
if self.chunk.get_mut().next().is_some() {
|
|
self.chunk = ArenaChunk::new(size + 1024, Default::default()).into();
|
|
} else {
|
|
self.chunk.get_mut().reset();
|
|
}
|
|
}
|
|
}
|
|
|
|
pub struct ArenaChunk {
|
|
base: *mut u8,
|
|
end: *mut u8,
|
|
size: usize,
|
|
}
|
|
|
|
impl Default for ArenaChunk {
|
|
fn default() -> Self {
|
|
Self {
|
|
base: core::mem::size_of::<Self>() as _,
|
|
end: core::mem::size_of::<Self>() as _,
|
|
size: 0,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ArenaChunk {
|
|
fn layout(size: usize) -> Layout {
|
|
Layout::new::<Self>().extend(Layout::array::<u8>(size).unwrap()).unwrap().0
|
|
}
|
|
|
|
fn new(size: usize, next: Self) -> Self {
|
|
let mut base = unsafe { alloc::alloc::alloc(Self::layout(size)) };
|
|
let end = unsafe { base.add(size) };
|
|
unsafe { core::ptr::write(base.cast(), next) };
|
|
base = unsafe { base.add(core::mem::size_of::<Self>()) };
|
|
Self { base, end, size }
|
|
}
|
|
|
|
fn alloc(&mut self, layout: core::alloc::Layout) -> Option<NonNull<u8>> {
|
|
let padding = self.end as usize - (self.end as usize & !(layout.align() - 1));
|
|
let size = layout.size() + padding;
|
|
if size > self.end as usize - self.base as usize {
|
|
return None;
|
|
}
|
|
unsafe { self.end = self.end.sub(size) };
|
|
debug_assert!(self.end >= self.base, "{:?} {:?}", self.end, self.base);
|
|
unsafe { Some(NonNull::new_unchecked(self.end)) }
|
|
}
|
|
|
|
fn next(&self) -> Option<&Self> {
|
|
unsafe { self.next_ptr().as_ref() }
|
|
}
|
|
|
|
fn next_ptr(&self) -> *mut Self {
|
|
unsafe { self.base.cast::<Self>().sub(1) }
|
|
}
|
|
|
|
fn contains(&self, arg: *mut u8) -> bool {
|
|
(self.base <= arg && unsafe { self.base.add(self.size) } > arg)
|
|
|| self.next().map_or(false, |s| s.contains(arg))
|
|
}
|
|
|
|
pub fn size(&self) -> usize {
|
|
self.base as usize + self.size - self.end as usize + self.next().map_or(0, Self::size)
|
|
}
|
|
|
|
fn reset(&mut self) {
|
|
self.end = unsafe { self.base.add(self.size) };
|
|
}
|
|
}
|
|
|
|
impl Drop for ArenaChunk {
|
|
fn drop(&mut self) {
|
|
if self.size == 0 {
|
|
return;
|
|
}
|
|
_ = self.next().map(|r| unsafe { core::ptr::read(r) });
|
|
unsafe {
|
|
alloc::alloc::dealloc(
|
|
self.base.sub(core::mem::size_of::<Self>()),
|
|
Self::layout(self.size),
|
|
)
|
|
}
|
|
}
|
|
}
|